Ontario Electrical Safety Code - Bulletins. Scope. (1) Introduction
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1 Ontario Electrical Safety Code - Bulletins Bulletin Grounding and bonding of solar photovoltaic systems Rules: , ,10-208, , , , , ,10-812, , , , , and Table 16 Scope Issued May 2012 Supersedes Bulletin (1) Introduction (2) Grounding of solar photovoltaic system output, ac grounding (a) Grounding of the utility disconnecting means that is required to be a service box (b) Grounding of solar photovoltaic systems located remotely from the utility interface switch (3) Grounding of ac modules and micro-inverters (4) Bonding (1) Introduction Rule states the grounding requirements for solar photovoltaic systems. It references Rules from Section 64 about grounding for renewable energy systems (Rules , and ). (2) Grounding of solar photovoltaic system output, ac grounding For parallel connection of solar photovoltaic systems, depending on the point of the connection, the utility disconnecting means may be required to be an approved service box as per Diagrams B1 and B3. 50 Diagram B1 shows the parallel connection of solar photovoltaic systems where the PV system is directly connected to the supply authority. The utility disconnecting means is required to be an approved service box. In accordance with Rule , the utility disconnecting means is required to be grounded as per Rule (1) requirements. The same requirements related to Diagram B1 are applicable where the PV system is indirectly connected to the supply authority, on the line side of the customer meter. Diagram B1 PV system is directly connected to the supply authority Page 1 of 6
2 Ontario Electrical Safety Code - Bulletins Diagram B2 shows the parallel connection of solar photovoltaic systems where the PV system is indirectly connected to the supply authority on the load side of the service box. The utility disconnecting means is not required to be an approved service box. Rule (1)(c) requires that no connection between the grounded circuit conductor and ground be made on the load side of the service disconnecting means. It is important not to connect the neutral conductor to the generation meter enclosure in order to eliminate parallel paths for neutral current. The neutral bonding jumper in the generation meter enclosure shall be removed or the neutral block shall be isolated from the meter base to prevent unintentional connection. Bonding from the meter enclosure to the utility disconnecting means as well as to the inverter shall be maintained. Diagram B2 PV system is indirectly connected to the supply authority, on the load side of the service box Diagram B3 shows the parallel connection of solar photovoltaic systems where the PV system is indirectly connected to the supply authority on the line side of the service box. The utility disconnecting means is required to be an approved service box. In accordance with Rule , the utility disconnecting means is required to be grounded as per Rule (1) requirements. The same requirements of not connecting the neutral conductor to the generation meter enclosure, as clarified in Diagram B2, are applicable Diagram B3 PV system is indirectly connected to the supply authority, on the line side of the service box Page 2 of 6
3 Ontario Electrical Safety Code - Bulletins (a) Grounding of the utility disconnecting means that is required to be a service box Where the utility disconnecting means is required to be an approved service box, to satisfy Rule requirements, the utility disconnect service box shall be grounded to: a new grounding electrode installed for the new service box. The two grounding electrodes (the new and the existing ) shall be interconnected as per Rule requirements (as per Diagram B4); or the new service box is grounded to the existing grounding electrode (as per Diagram B5) Diagram B4 Service box grounded to a new grounding electrode 50 Diagram B5 Service box grounded to the existing grounding electrode Page 3 of 6
4 Ontario Electrical Safety Code - Bulletins (b) Grounding of solar photovoltaic systems located remotely from the utility interface switch Question 1 For Distributed Generation systems where the generator(s) and inverter(s) are located remotely from the utility interface switch and meter base, is it permitted to re-establish grounding of the identified (neutral) conductor at the remote location in accordance with Rule (a) in lieu of carrying the circuit bonding conductor with the circuit conductors? Answer 1 Yes, it is permitted to re-establish grounding of the identified (neutral) conductor at the remote location pro vided that the conductor is routed from the utility interface switch (service box) to the remote location and is grounded in a Code compliant manner. Examples of acceptable remote locations where the grounding is permitted to be re-established: A disconnect switch that has provisions for grounding of the identified (neutral) conductor as well as bonding of the neutral block to the switch/device enclosure as per Diagram B6. An inverter that has a provision for grounding of the identified (neutral) conductor and termination of the grounding conductor. Diagram B6 Grounding of solar photovoltaic systems at a disconnect switch located remotely from the utility interface switch BT equipment bonding terminal GND grounding conductor (electrode) terminal (*) - The size of DC grounding conductor for solar photovoltaic systems is clarified with Question 1 in Section (2)(a). Rationale 1 The answer is provided applying Rule and considering the remote generation structure as a remote structure fed from the main building or the pole where the LDC metering and main service box are located. Rule permits the practice for other types of installations where two or more buildings or structures are fed from a single service, and in fact requires this for buildings housing livestock. (3) Grounding of ac modules and micro-inverters Rule defines an ac module and Bulletin 50-1-* provides clarification for ac module unique installation requirements. For ac modules where the inverter is an integral part of the generator (i.e. photovoltaic system) and there is no accessible dc wiring, there is no requirement or provision for dc grounding. Page 4 of 6
5 Ontario Electrical Safety Code - Bulletins (4) Bonding Rule requires exposed, non-current carrying metal parts of fixed equipment to be bonded to ground. Therefore, non-current carrying metal parts of PV panels, equipment and conductor enclosures shall be bonded. The bonding conductor shall be sized as per Rule and shall be not less than that given in Table 16. The equipment bonding conductor shall be installed in accordance with Rule (5) and (6) requirements. Rule (5)(b) and (6)(b) requires a bonding conductor smaller than No. 6 AWG copper or No. 4 AWG aluminum respectively, to be installed and protected in the same manner as the circuit conductors, or be installed in a raceway or armoured cable. In accordance with Rule requirements, the connection to a module or panel shall be arranged so that removal of a module or panel from a photovoltaic source circuit shall not interrupt a bonding conductor to other photovoltaic source equipment. Photo B1 is an example of non-compliant installation. Photo B1 Unacceptable bonding conductor connection 50 There is more than one way to satisfy this Rule requirement, e.g. bonding the frame, where the frame is electrically continuous or connecting the bonding conductor as per Photo B2. Photo B2 shows the bonding conductor that is continuous through the two bonding clamps so that the panel can be removed without interrupting the continuity of the uncut conductor. Page 5 of 6
6 Ontario Electrical Safety Code - Bulletins Photo B2 Example of acceptable connection of bonding conductor A bonding means for modules shall be installed per the module manufacturer instructions in order to minimize deterioration from galvanic action that may result from the combination of dissimilar metals as referenced by Rule Page 6 of 6
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